Objective To determine the measurement of two-dimensional shape parameters of nose and to eatablish the symmetric standard of nasal morphology.Methods Twenty-three frontal view photo-graphs of children aged 5 years with unilateral cleft lip were randomly selected,in which all children in the photographs were at an elevation of 45 degrees.Using Osiris and Image J for image intensification and di-vision,the area of nostril and nasal form were measured and artificial geometry figure were determined.Results The area of nostril affected was significantly smaller than those unaffected(P